All objects with a temperature above absolute zero emit some degree of thermal radiation. This kind of radiation, which is not visible to the human eye, can be detected by thermal sensors.
Thermal camera sensors remain unaffected by darkness or fickle weather conditions such as rain, fog, or snow. These cameras make a great platform on which to build more efficient 24/7 surveillance systems.
Thermal imaging is critical in open and expansive areas like borders, coastlines, and forests. They are quite at home in applications such as perimeter patrol, ports and harbours, critical infrastructure, processing and manufacturing plants.